Dupont Delrin® rod and Acetal Rods
Many of our clients assume that Delrin® rod and Acetal rod are the same thing. This is not quite true.
Delrin® is the trade name for Homopolymer Acetal made by Dupont. This is the most recognized of all trade names for Acetal materials, but far from the only available Acetal material.
The Co-Polymer Acetal is produced by a wide variety of large plastic manufacturers, BASF is probably one of the largest and most well known. Some main resin names are: BASF Ultraform® H4320, Kepital® F10-02, or Hostaform® M25.
While Delrin® is a wonderful material, in larger cross sections or larger diameters, the Delrin® brand Homo-Polymer can exhibit center line porosity, or soft centers. This can sometimes be seen with the naked eye, and is a darker white in a normally milky white natural colored material. This center line porosity can cause problems in some applications. This porosity can cause leakage of fluid if under pressure, or soft center’s of Delrin® Rod and Delrin® Sheet.
This should not stop you from considering Delrin® though. Many other properties of the Delrin® resin are superior to the Co-Polymer resins. These properties are:
|Tensile Strength Yield||D638||9,600 – 11,000||9,000 – 10,200|
|Izod Impact – Notched||D256||1.2||1.0|
|Hardness – Rockwell||D785||M94||M90|
|Deflection Temp @ 264psi||D648||257||220|
|Deflection Temp @ 66 psi||D648||347||335|
|Water Absorption @ 24 hrs||%||0.24||0.25|
|Co. Thermal Expansion||D696||6.83X10-5||5.4X10-5|
Some key properties for Delrin® are: higher tensile strength, increased Izod impact, higher deflection temperatures and it is slightly harder. The co-efficient of thermal expansion is a bit higher, and needs to be considered when designing a new part. Delrin brand material also comes in several resin variations, including: Delrin® 150 and Delrin® 507, contact us for details.
Many of our clients prefer the Delrin® brand rod and sheet for small machined parts. This is due to the increase in a few key properties, and of course brand recognition.
The Acetal family of plastic resins are excellent for wear resistance, great mechanical strength, and superior machining properties. It is available in a huge range of sizes and shapes. Click here for more details on Acetal – Delrin® Rod, and sometimes referred to as plastic dowel. We also have the capacity to supply colored Acetal – Delrin® rod; click here from more details on the colored Acetal material.
Please contact us for more details on these and other plastic materials. For a comparison chart of plastic materials click here: Plastic Materials Selection Guide